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Should work setting the registry for Windows. Adobe Reader takes the setting of Windows as the default to save copy to....same as opening notepad and chooseing Save As.

If you just want My Documents location set for everything that reads that setting in the registry, go here...
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
change the Personal value to any location you desire. This is the easiest choice.

You can even go further and give the user more than one choice.
Open Registry Editor and navigate to:

HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ comdlg32 \ Placesbar
You have to create a key called Placesbar
Then create a string value in Placesbar and call it place0 with a value of a path you want as first choice...ex: c:\mydocs